WO2002096006A2 - Hybrid automatic repeat request (harq) scheme with in-sequence delivery of packets - Google Patents

Hybrid automatic repeat request (harq) scheme with in-sequence delivery of packets Download PDF

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Publication number
WO2002096006A2
WO2002096006A2 PCT/IB2002/001651 IB0201651W WO02096006A2 WO 2002096006 A2 WO2002096006 A2 WO 2002096006A2 IB 0201651 W IB0201651 W IB 0201651W WO 02096006 A2 WO02096006 A2 WO 02096006A2
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Prior art keywords
data blocks
data block
receiving terminal
sequence
terminal
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PCT/IB2002/001651
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English (en)
French (fr)
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WO2002096006A3 (en
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Esa Malkamaki
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Nokia Corporation
Nokia Inc.
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=23122846&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2002096006(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nokia Corporation, Nokia Inc. filed Critical Nokia Corporation
Priority to JP2002592541A priority Critical patent/JP3746271B2/ja
Priority to KR1020037014834A priority patent/KR100895026B1/ko
Priority to AU2002258064A priority patent/AU2002258064A1/en
Priority to EP02727894A priority patent/EP1388234B1/de
Priority to CA2446700A priority patent/CA2446700C/en
Priority to BR0209809-1A priority patent/BR0209809A/pt
Priority to AT02727894T priority patent/ATE515848T1/de
Publication of WO2002096006A2 publication Critical patent/WO2002096006A2/en
Publication of WO2002096006A3 publication Critical patent/WO2002096006A3/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1657—Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
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    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1841—Resequencing
    • H—ELECTRICITY
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/187—Details of sliding window management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1803—Stop-and-wait protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0096—Channel splitting in point-to-point links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/324—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the data link layer [OSI layer 2], e.g. HDLC
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention relates to wireless communication, such as provided by systems as specified in 3GPP (Third Generation Partnership Project) Wideband Code Division Multiple Access (WCDMA) release 5, High Speed Downlink Packet Access (HSDPA) , but also as provided by other kinds of wireless communication systems. More particularly, the present invention relates to a modification of the so-called hybrid automatic repeat request (HARQ) used in HSDPA, a modification that allows in-sequence delivery of protocol data units (PDUs) to the radio link control layer (RLC) of the receiving wireless terminal .
  • HARQ hybrid automatic repeat request
  • high speed data transmission may be enabled by means of the so-called high speed downlink packet access (HSDPA) transmission, which may provide functions such as fast hybrid automatic repeat request (HARQ) , adaptive coding and modulation (AMC) , and fast cell selection (FCS) .
  • HSDPA high speed downlink packet access
  • HARQ fast hybrid automatic repeat request
  • AMC adaptive coding and modulation
  • FCS fast cell selection
  • a channel between the media access control (MAC) layer and the physical (PHY) layer also allocates and uses an associated dedicated channel (DCH) .
  • the dedicated channel may be mapped to a dedicated physical channel (DPCH) in the physical layer.
  • the DPCH is typically divided into a dedicated physical data channel (DPDCH) and a dedicated physical control channel (DPCCH) , both in the uplink and in the downlink.
  • Data such as power control commands, transport format information, and dedicated pilot symbols are transmitted on the DPCCH.
  • Information such as diversity feedback information may also be transmitted on DPCCH in the uplink.
  • the HS-DSCH may be mapped to one or several high speed physical downlink shared channels (HS-PDSCH) in the PHY layer.
  • the associated dedicated channel DCH is usually allocated for both the downlink and the uplink, and is usually used to carry HSDPA-related information and signaling as well as other dedicated data, such as speech and control data.
  • a user terminal may communicate with several base stations (the term base station being used here in some places to indicate what is called a node B in UTRAN (Universal Mobile Telephone System (UMTS) Terrestrial Radio Access Network) specifications) at the same time during what is called soft handover, and in such situations the associated dedicated channel is said to be in soft handover.
  • UTRAN Universal Mobile Telephone System
  • DCH dedicated channel
  • SCCH shared control channel
  • a SCCH can be used to carry HS-DSCH specific information and signaling to users receiving data on the HS-DSCH.
  • the dedicated channel (DCH) would be used to inform the user equipment that it has data to be read on the HS-DSCH and SCCH; in such an arrangement, a user would receive an indication on the dedicated channel of data to be read only when there is data for the user.
  • the dedicated channel would serve as a pointer channel, since it would point the user to the shared channels .
  • the dedicated channel would also convey information about modulation and coding schemes, power levels and similar parameters used for the shared channels. This information could also be sent on the shared channel. If the shared control channel is used carry this information, then it must be transmitted earlier than the corresponding shared data channel (HS-DSCH) .
  • the shared control channel would be used to carry information that is specific to the data transmitted on the shared data channel, information such as packet numbers for the HARQ process as well as other information.
  • the shared control channel could be sent as a separate code channel (i.e. it could be code multiplexed) or could be sent using the same code channels as the HS-PDSCH (i.e. it could be time multiplexed with the HS- PDSCH) .
  • the HS-DSCH is assumed not to be in soft handover; each base station is assumed to have its own shared channel and a user terminal is assumed to receive data on a HS-DSCH from only one base station at a time.
  • FCS fast cell selection
  • the shared channels would not use power control. Instead, the shared channels are proposed to be transmitted either with power that is fixed or with power that is semi - fixed (meaning that the power is not changed too of en) .
  • the power could, for instance, be a cell-specific parameter.
  • the high speed downlink shared channel (HS-DSCH) is planned to be associated with a dedicated channel that would carry in the downlink at least information regarding the timing when the receiving station is to receive on a shared channel.
  • the associated dedicated channel would carry, among other information, required acknowledgements (ACK) used in a so- called fast HARQ, i.e. the HARQ process used by the MAC-high- speed (MAC-hs) layer/ entity/ service, as explained for explained in 3GPP TR 25.950 v4.0.0 (2001-03) UTRA High Speed Downlink Packet Access.
  • a HARQ process is used to indicate what is sometimes called a HARQ 'channel';
  • a data block is used here to indicate a HARQ data block and is a block of data transmitted (and retransmitted) by a HARQ entity in MAC-hs.
  • a packet is a general term, and is sometimes used to mean a data block and sometimes a RLC PDU.
  • RLC-PDUs packets
  • UM unacknowledged mode
  • RLC-SDU complete RLC service data unit
  • AM acknowledged mode
  • RLC-PDUs of a message are not received in sequence, some RLC- SDUs may be discarded unnecessarily for UM and some unnecessary RLC-PDU retransmissions may be generated for AM. Therefore, it is advantageous for either MAC-hs to provide in-sequence delivery of the RLC-PDUs of a message or for the RLC layer to be modified to support out of sequence delivery of RLC-PDUs.
  • RLC- control PDUs which are not numbered, and so, if received out of sequence, cannot be reordered based on RLC PDU sequence numbers .
  • HARQ data block numbering is required. (RLC-PDU numbering is usually not known at the MAC layer.)
  • This data block numbering should be across the HARQ processes (or the N HARQ channels' as they are called in TR 25.950) to recover from lost TTIs (transmission time intervals), i.e. TTIs for which the user terminal identifier cannot be read.
  • a TTI is the time between consecutive deliveries of data between the medium access control (MAC) layer and the LI transport layer, and so defines the periodicity at which Transport Block Sets are transferred to the physical layer on the radio interface.
  • HARQ processes are the same as HARQ channels as described in TR 25.950.
  • SAW stop-and-wait
  • the incoming data blocks are distributed to different HARQ processes .
  • the receiver has to know which HARQ process is being received at each moment. Therefore, the HARQ process number has to be sent on the shared control channel.
  • HARQ process numbers are not needed since the soft combining of first transmissions and retransmissions of the same block can be based on the HARQ data block number.
  • SR selective repeat
  • 3 bits are needed to signal the HARQ process number.
  • at least one bit sequence number is needed per HARQ process (channel) to recover from errors in ACK/NACK. This implies that at least four-bit 'sequence numbers' are needed with asynchronous N-channel HARQ.
  • Four-bit sequence numbers would not, however, guarantee in-sequence delivery of the packets (RLC-PDUs) .
  • the SAW protocol guarantees that within each HARQ process the data blocks are delivered in order. However, it is possible that a data block in one HARQ process goes through faster (with less retransmissions) than another (earlier) data block in another HARQ process. Furthermore, if a data block is totally missed in between (i.e. the UE does not know whether the lost block was intended for it or for some other UE) , then the UE can not continue to keep track of the correct order of the data blocks .
  • N-process HARQ scheme i.e. an N-process HARQ scheme
  • sequence numbers are long enough to guarantee in-sequence delivery of packets (RLC-PDUs) to the RLC layer by the MAC-hs layer, but short enough so as not to significantly increase the signaling ],oad.
  • a method for use in a wireless communication system using a layered protocol, a method in which a first protocol layer of a sending terminal sends packets as a sequence of data blocks to a peer first protocol layer of a receiving terminal, which delivers the packets to a higher protocol layer, the method including: the sending terminal, in response to a sequence of data blocks for transmission to the receiving terminal, assigning a respective data block sequence number to each data block in the sequence of data blocks; and the receiving terminal, in response to the sequence of data blocks and to the respective data block sequence numbers, delivering in order at least some of the data blocks in the sequence of data blocks to the higher protocol layer of the receiving terminal ; the method characterized by the receiving terminal acknowledging receipt of the data blocks without providing information indicating the respective data block sequence numbers.
  • the sequence numbers may be communicated in-band with the data blocks or out-band, and if delivered out-band, the sequence numbers may be used in HARQ combining. Also in accord with the first aspect of the invention, each data block may be acknowledged separately, and the acknowledgement may be sent after a predefined delay.
  • the layered protocol may include a MAC layer having a MAC-hs entity and also including an RLC layer, and the first layer may be the MAC layer, and the higher layer may be the RLC layer, and the MAC-hs entity of the receiving terminal may provide the signaling acknowledging receipt of the data blocks without use of sequence numbers and may deliver the data blocks in order to the RLC layer of the receiving entity.
  • a wireless terminal for use in wireless communication via a wireless communication system with other communication devices including other wireless terminals, characterized in that it is operative as either a sending terminal or as a receiving terminal according to the respective steps of the first aspect of the invention.
  • a wireless communication system for use in providing at least parts of connections between wireless terminals and other communication devices including other wireless terminals via wireless communication, the wireless communication system having terminals at least two of which are able to function as a sending terminal and as a receiving terminal, characterized in that the at least two terminals are both operative as both a sending terminal and a receiving terminal according to the respective steps of the first aspect of the invention.
  • the invention can also be used to provide for in-sequence delivery of control PDUs.
  • Fig- 1 is a data block diagram/ flow diagram of a system including a sending terminal (a base station or a wireless terminal such as a mobile phone) and a receiving terminal (a base station or a wireless terminal) , where the sending terminal is sending a sequence of data blocks to the receiving terminal according to the invention;
  • Fig. 3 is a flowchart of the operation of the receiving terminal of Fig. 1, according to the invention, in receiving a sequence of data blocks from the sending terminal of Fig. 1 ;
  • Fig. 4 is a flowchart of the overall process in which the sending terminal of Fig. 1 sends the receiving terminal of Fig. 1 a sequence of data blocks, according to the invention.
  • the invention For wireless transmission of packets (RLC-PDUs) , encapsulated in (MAC) data blocks, between the RLC layers of two terminals using the MAC layer service MAC-hs, the invention provides an asynchronous N-channel HARQ scheme in which HARQ sequence numbers of at least five bits are used across the N channels (i.e. across the HARQ process), i.e. for each MAC-hs data block. Using such sequence numbers can guarantee in-sequence delivery of RLC-PDUs (packets) , after being transmitted encapsulated in (MAC) data blocks, by the MAC-hs service of the receiving terminal .
  • the (MAC) data blocks are provided to the PHY layer via transport channels during TTIs.
  • the physical layer knows which blocks to combine based on the HARQ process number.
  • the MAC-hs data block number is sent out-band on the SCCH, then the MAC- hs data block number (instead of the HARQ process number) can be used to indicate which blocks to combine.
  • the MAC-hs layer would then use these MAC-hs data block numbers to resequence the data blocks received over the N channels, i.e. MAC-hs holds the data blocks (which contain the RLC PDUs) in a resequencing buffer until all are received correctly and ordering the correctly received data blocks before delivery to the RLC.
  • the invention is described below in the context of WCDMA HSDPA, and in particular in case of a downlink data transmission and uplink ACK/NAK signaling. It should be understood, however, that the invention is of use in other contexts, including downlink ACK/NAK signaling, and in case of communication using other than WCDMA HSDPA.
  • a sending terminal 11 and a receiving terminal 12 are each shown as including modules 11a lib lie 12a 12b 12c for operating according to a WCDMA protocol. More specifically, in the sending terminal 11, an RLC module 11a is a source of a sequence of packets (RLC- PDUs) intended for a peer RLC module 12a of the receiving terminal 12.
  • the RLC module 11a of the sending terminal provides the sequence of packets to a MAC-hs module lib of the sending terminal, which, according to the invention, after encapsulating the packets in MAC data blocks, assigns a respective sequence number to the data blocks.
  • Figure 1 is a simplified view of the operation of a receiving terminal .
  • Some protocol layers/ entities are omitted for clarity, such as the MAC-d entity and the MAC-c/sh entity between the RLC and the MAC-hs entity.
  • a PHY module 12c receives the various physical channels used to convey the data blocks and their respective sequence numbers and provides them to a MAC-hs module 12b (over various transport channels) . Then, using ACK/NAK signaling to prompt the sending terminal to resend the data blocks that are not successfully received, the MAC-hs data block 12b extracts from each (MAC-hs) data block whatever packets are encapsulated in the data block and, based on the respective sequence numbers of the data blocks (and assuming that the packets are encapsulated within the data blocks in sequence) , provides the packets in-sequence over one or another logical channel to the RLC module 12a of the receiving terminal, according for example to the procedure illustrated in Fig.
  • the so-called fast HARQ i.e. the HARQ used by the MAC- hs layer, works as follows.
  • a packet scheduler allocates a downlink channel for the given user terminal, AMC control selects an appropriate modulation and coding scheme (MCS) , and depending on the MCS, transmits one or several packets in a data block to the user terminal .
  • MCS modulation and coding scheme
  • TTIs more data, i.e., more data blocks can be transmitted to the same user terminal or to other user terminals.
  • the data blocks sent to a given user terminal are numbered sequentially (modulo 32, if five-bit sequence numbers are used) .
  • the user terminal receives a data block, its physical layer first decodes the shared control channel to get the sequence number (as well as other relevant information sent on SCCH) . Based on the sequence number, the user terminal ' s physical layer checks a soft combining buffer, where it stores data blocks it has already received but which have errors, to determine whether it has already received the data block indicated by the sequence number, i.e. to determine whether the data block is a retransmitted data block.
  • erroneous data blocks are buffered in soft decision format in the soft combining buffer to await retransmissions, and each data block stored there is associated with a corresponding sequence number) .
  • the user terminal ' s physical layer determines that the data block is a retransmitted data block, then it combines the retransmitted data block and the earlier received data block, and decodes the combined data block.
  • the retransmission can be identical to the original transmission, in which case the ARQ scheme is called Chase combining, or the retransmission can contain additional redundancy, in which case the ARQ scheme is called incremental redundancy or type II hybrid ARQ.
  • the receiver checks whether all earlier data blocks in the sequence (based on the sequence number) have already been received correctly (i.e. whether all earlier data blocks in the sequence are in the resequencing buffer and indicated as having been successfully received) . If so, then the packets of the data block are delivered to higher layers (in the order in which they are encapsulated in the data block) , but if not, then the data block is stored in the resequencing buffer to wait until the earlier data blocks are received correctly too. In this way, the in-sequence delivery of the packets (RLC-PDUs) can be guaranteed.
  • the transmitter simply marks it as correctly received (but does not move the window) and waits for additional acknowledgements.
  • the receive window is moved if the correctly received data block is the first in the window.
  • MAC-hs delivers to the higher protocol layers (such as the RLC layer) the correctly received data blocks in-sequence (and so the packets within the data blocks, in the order they were encapsulated within the data blocks) , and moves the receive window to the first missing data block (i.e. the first data block not indicated as having been correctly received) .
  • the invention preferably uses N-channel transmission, i.e. the use of N parallel channels by the sending entity (for example a base station) for communicating packets to the receiving entity (for example a user wireless terminal such as a mobile phone) .
  • N-channel transmission up to N data blocks must be stored in the soft decision buffer.
  • the retransmissions can be either synchronous (retransmission only allowed in every N t TTI, i.e. in TTI number x+N, x+2N, and so on, where x is the TTI number of the first transmission) or asynchronous (retransmission allowed in any TTI after the minimum . round trip delay, i.e.
  • the soft combining is based on the sequence numbers for either synchronous or asynchronous transmission; i.e. even in the synchronous case, the receiver should check that the sequence number of a received data block is the expected sequence number before combining the data block with an earlier received data block.
  • the invention does not require using N-channel transmission, i.e., the soft combining can be based on the sequence numbers provided that they are sent out-band.
  • N-channel transmission is used, and a maximum of N data blocks is kept in the transmit buffer awaiting ACK, and the transmitter does not send a new data block if there are already N unacknowledged data blocks (data blocks for which either an ACK/NAK has not yet been received or for which a NAK has been received) .
  • a data block can be sent on several channels without awaiting ACKs (a kind of multi-copy transmission) , which can be useful when (re) transmitting the last data blocks of a message, since the delay on average can be reduced when multiple copies are sent (because of there then being a higher probability of correct decoding) .
  • the data blocks can even be soft combined, if required, based on the sequence numbers of the data blocks.
  • h bit map can be used to acknowledge several earlier data blo ⁇ ks . It is, however, preferable that the ACK for a data block be sent immediately following receipt of the data block even if the ACK is a bit map. With such a procedure, the ACK for some data blocks might be sent several times, but such muLtiple ACK signaling can help in recovering from erroneous orj missing ACKs.
  • a bit map used as an ACK signal could acknowledge either the last n data blocks for the given user, or, preferably, the last n TTIs, in which case not all the data bl ⁇ ks are necessarily for the given user.
  • a node B tc a first user terminal, indicated as user terminal numh ⁇ r 1.
  • the node B sends a pointer 21a on the downlin. (DL) DPCH to user terminal number 1, the pointer indicatingto terminal number 1 that it should read DL SCCH number 1 in ;he next time slot.
  • user terminal number 1 reads the shard control channel SCCH, where it finds, among other information, the sequence number 21b of the MAC-hs data block 21c sent on HSPDSCH (high speed physical downlink shared channel) .
  • HSPDSCH high speed physical downlink shared channel
  • the data block 21c the data block is not received correctly, and so, after decoding the data block, user terminal number 1 sends an NAK 2Id on the uplink DPCCH after a given delay.
  • the transmitter knows which data block is being acknowledged based on the timing of the ACK/NAK. Therefore, no data block number is needed in the NAK.
  • the node B retransmits the erroneously received data block as a new data block 22c, again providing a pointer 22a to a sequence number 22b (the same as for the originally transmitted data block) , and in the example illustrated, the second transmission is successful and terminal number 1 sends an ACK 22d to the node B.
  • a flowchart of receiver operation according to the invention is illustrated assuming that soft buffering (i.e. the buffering in the soft combining buffer in soft decision format) , soft combining and resequencing buffering is based on data block sequence numbers sent on a DL SCCH, and that ACK/NAK signaling is sent in a predetermined time position and so does not include data block sequence numbers.
  • soft buffering i.e. the buffering in the soft combining buffer in soft decision format
  • soft combining and resequencing buffering is based on data block sequence numbers sent on a DL SCCH
  • ACK/NAK signaling is sent in a predetermined time position and so does not include data block sequence numbers.
  • the receiving terminal uses two buffers: a soft combining buffer in the physical layer in which received data blocks are held until they are decoded without error, a data block here possibly being combined with earlier transmissions of the same data block in order to do the decoding; and a resequencing buffer in the MAC-hs layer where successfully decoded data blocks in a sequence of data blocks are stored until they can be delivered in sequence.
  • the receiving terminal uses a window, which it slides over the data blocks in the resequencing buffer, with the window positioned on the earliest data block in the sequence yet to be sent to the next higher layer of the protocol (the RLC in the example being given) .
  • Fig. 3 is one example of a possible operation of the invention. Currently, it is specified (by 3GPP) that there be no pointer and SCCH is sent partly before HS-PDSCH, which is also relevant to what is indicated in Fig. 2.
  • Fig. 3 The operation is shown in Fig. 3 as beginning with a first step 31 in which the receiving wireless terminal (for example a mobile phone) receives the DL DPCH allocated to it by the sending terminal (a node B in the context being described) and so receives a pointer if a pointer has been communicated. If so, then in a next step 32, the receiving terminal receives the DL SCCH pointed to and the HS-PDSCH also pointed to by the pointer communicated via the DL DPCH allocated to the receiving terminal .
  • the receiving wireless terminal for example a mobile phone
  • the receiver e.g., the MAC-hs layer
  • the receiver sends an NAK to the sending terminal (i.e.
  • the ACK/NAK signaling indicated in Fig. 3 is to be understood to be signaling without reference to sequence numbers .
  • the data block is removed from the soft combining buffer and placed in the resequencing buffer, and an ACK is sent to the sending terminal, and then, if the data block is the first data block in the receive window that slides over the resequencing buffer (based on the sequence number) , in a next step 38 it is delivered to the next higher layer of the protocol (as packets), i.e.
  • the receive window is moved up along the resequencing buffer so that a next data block in the sequence is the first in the window, but if the decoded data block is not the first, then it is stored in the resequencing buffer for later delivery to the next higher layer.
  • the receiver e.g., the MAC-hs layer
  • the receiver performs ACK/NAK signaling without using sequence numbers, until all data blocks and their respective sequence numbers are successfully received.
  • MAC-hs MAC-hs data blocks containing one or more packets
  • RLC-PDUs packets
  • the sending terminal sends the data blocks and sequence numbers to the receiving terminal, using various possible transport channels that map to various possible physical channels; for example, in a system operating according to WCDMA, the sending terminal might use a HS-PDSCH (physical) channel to send the data blocks, and a DL SCCH channel to send the sequence numbers, as in Fig. 2.
  • the receiving terminal receives the channels over which the data blocks and corresponding sequence numbers are communicated.
  • the MAC-hs service of the receiving terminal delivers a data block (as packets) in the sequence of data blocks to the RLC layer of the receiving terminal only after each earlier data block in the sequence has been correctly received and provided to the RLC layer (as packets) ; during this last step 44, as illustrated in Fig. 3, the receiving terminal will perform ACK/NAK signaling, without using sequence numbers, until all data blocks and their respective sequence numbers are successfully received.
  • the data block sequence numbers can be sent time multiplexed on the shared data channel , or they can be sent on the dedicated data channel (pointer channel) for the terminal for which the sequence numbers are intended.
  • the dedicated data channel pointer channel
  • the shared control channel is transmitted at the same time as the shared data channel, and the pointer on the dedicated channel is sent before the shared channels.
  • the shared control channel (SCCH) is sent, at least partly, before the shared data channel, and the dedicated pointer channel is sent in parallel with the shared control channel.
  • the dedicated pointer channel and the shared control channel are sent parallel with the shared data channel.
  • the data block sequence numbers would then be sent before the corresponding data blocks are sent on a shared data channel
  • the sequence numbers would be sent in parallel with the data blocks (which would again be sent on a shared data channel) .
  • the system could also work without the dedicated pointer channel .
  • the data block sequence number could even be sent in-band with the data blocks, i.e., with the same CRC (error detection) as the data blocks.
  • the data block sequence numbers are sent in-band with the data blocks, the data block sequence numbers cannot be used for soft combining, and another mechanism is needed for soft combining: e.g., some form of synchronous transmission scheme (such as fully or partially synchronous N-channel SAW) or an asynchronous N-channel SAW with HARQ process numbers sent out-band. All that is required by the invention is that the data blocks be numbered and that the data block sequence number be transmitted somehow with the data blocks in the downlink, which then enables reordering of the data blocks at the receiving terminal and in-sequence delivery of the data blocks by the MAC-hs layer of the receiving terminal to the RLC layer of the receiving terminal.
  • some form of synchronous transmission scheme such as fully or partially synchronous N-channel SAW
  • asynchronous N-channel SAW with HARQ process numbers sent out-band e.g., some form of synchronous transmission scheme (such as fully or partially synchronous N-channel SAW) or an asynchronous N-channel SAW with HARQ process numbers
  • the ACK/NAKs are preferably based on time position (using a predetermined delay between the received data block and the transmitted ACK/NAK) and so need not include the data block sequence number (or data block numbers, in case of ACK/NAK signaling for more than one data block at a time) .
  • Still another embodiment of the invention could use partial data block numbers in the ACK/NAK signaling, in addition to using time position.
  • the data block sequence number in the downlink is, e.g., five bits
  • the ACK/NAK signaling to the node B by the receiving terminal could include 1 or 2 bits of the data block sequence number (preferably least significant bits) .
  • blocks are delivered to the RLC (the higher protocol layer) of the receiving terminal in order by the MAC-hs (an entity of the lower protocol layer) of the receiving terminal, using the MAC-hs generated sequence numbers.
  • the receiving terminal sends ACK/NAK signaling to the sending terminal, ACK/NAK signaling that does not include information indicating sequence numbers of any blocks received in error.
  • each block can be acknowledged after a predefined delay and thus the sending terminal knows which block is being acknowledged.
  • Many prior art protocols acknowledge (in the course of ACK/NAK signaling) using a bit map where each bit indicates a data block. Typically there is at least one sequence number that indicates the starting point or the ending point of the bit map, but most of the blocks are acknowledged without an express sequence number (i.e. using a bit in the bit map, as opposed to a sequence number) . In such protocols, however, even if the sequence number is not expressly indicated for each block, it is there, i.e. the signaling according to these protocols provides information indicating the sequence numbers of the blocks being referred to in the ACK/NAK signaling.
  • the invention does not ensure that all of the blocks are delivered to the RLC (higher protocol layer) of the receiving terminal, only that those that are delivered are delivered in order; missing blocks are requested by the higher layer from the peer higher layer in the transmitter (sending terminal) .
  • there may be holes (missing blocks) but no block should pass ahead of any other block on its way to the higher protocol layer.
PCT/IB2002/001651 2001-05-18 2002-05-14 Hybrid automatic repeat request (harq) scheme with in-sequence delivery of packets WO2002096006A2 (en)

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JP2002592541A JP3746271B2 (ja) 2001-05-18 2002-05-14 パケットのインシーケンス送達を用いたハイブリッド自動再送要求方式
KR1020037014834A KR100895026B1 (ko) 2001-05-18 2002-05-14 패킷의 순차적인 전달 기능을 갖는 혼성 자동 재송 요구기법
AU2002258064A AU2002258064A1 (en) 2001-05-18 2002-05-14 Hybrid automatic repeat request (harq) scheme with in-sequence delivery of packets
EP02727894A EP1388234B1 (de) 2001-05-18 2002-05-14 Harq-schema (harq) mit sequentierter ablieferung von paketen
CA2446700A CA2446700C (en) 2001-05-18 2002-05-14 Hybrid automatic repeat request (harq) scheme with in-sequence delivery of packets
BR0209809-1A BR0209809A (pt) 2001-05-18 2002-05-14 Método, sistema, terminal sem fio, e estação base para uso em um sistema de comunicação sem fio usando protocolo em camadas
AT02727894T ATE515848T1 (de) 2001-05-18 2002-05-14 Harq-schema (harq) mit sequentierter ablieferung von paketen

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US60/292,023 2001-05-18

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US7310336B2 (en) 2007-12-18
ATE515848T1 (de) 2011-07-15
WO2002096006A3 (en) 2003-05-01
EP1388234B1 (de) 2011-07-06
EP1388234A2 (de) 2004-02-11
EP2267932A1 (de) 2010-12-29
KR100895026B1 (ko) 2009-04-24
CN1524364A (zh) 2004-08-25
ES2365801T3 (es) 2011-10-11
CN100521630C (zh) 2009-07-29
DE60240446C5 (de) 2017-05-11
EP1388234A4 (de) 2006-11-22
JP2004527979A (ja) 2004-09-09
BR0209809A (pt) 2004-06-01
CA2446700A1 (en) 2002-11-28
EP2267932B1 (de) 2014-03-05
AU2002258064A1 (en) 2002-12-03
CA2446700C (en) 2010-10-26
KR20030097867A (ko) 2003-12-31
US20020172208A1 (en) 2002-11-21
JP3746271B2 (ja) 2006-02-15
DE20221907U1 (de) 2009-05-20

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